How does the structure help the Hemoglobin perform its function

Hemoglobin is a protein in red blood cells that is made up of four chains. Each of these chains contains a compound known as heme, which in turn contains iron, which is what transports oxygen in the bloodstream. The pigment in hemoglobin is responsible for the red color of blood.

answer; the correct answer is conflict- related aggression; +

b. lithosphere, asthenosphere, mesosphere   is the answer most likely